WO2002055247A2

WO2002055247A2 - Cutting system

Info

Publication number: WO2002055247A2
Application number: PCT/EP2001/015364
Authority: WO
Inventors: Martin Heide; Roland Henzler
Original assignee: Reich Spezialmaschinen Gmbh
Priority date: 2001-01-09
Filing date: 2001-12-28
Publication date: 2002-07-18
Also published as: DE10101673C2; EP1412120B1; WO2002055247A3; AU2002240884A1; EP1412120A2; ATE299062T1; DE10101673A1

Abstract

The invention relates to a cutting system for machines for machining rectilinearly and continuously moving plate-shaped work pieces, for the purpose of severing the projecting front and rear ends of the edges. The cutting system comprises at least one saw unit provided with a motor-driven saw blade, which is mounted so as to be displaceable between a position above the work pieces and a position below the work pieces at an angle to the direction of movement of the work pieces, and a feeler, associated with the saw blade and having a feeler surfaces. Said feeler surface is aligned with the cutting plane of the saw blade and can be placed on the front or rear transversal face of the work pieces. The aim of the invention is to improve the cutting system in such a manner as to eliminate the danger of the surface of the transversal faces of the work pieces being damaged. To this end, the feeler comprises an alignment element that is displaced together with the saw unit and a feeler element that is displaced relative to the alignment element and comprises the feeler surface.

Description

Snipping unit

The invention relates to a cross-cutting unit for machines for processing rectilinear and continuously moving plate-shaped workpieces in a workpiece pass plane for separating overhangs of edge material projecting beyond the front and rear transverse sides of the workpieces which are oriented essentially transversely to the direction of movement of the workpieces and which run on parallel to the direction of movement Is attached to the long sides of the workpieces, with at least one saw unit comprising a motor-driven saw blade, which is held so that it can be moved obliquely to the direction of movement of the workpieces between a position above the workpieces and a position below the workpieces, and with a sensing element assigned to the saw blade and having a sensing surface, wherein the touch surface is aligned with the cutting plane of the saw blade and can be placed on the front or rear transverse side of the workpieces.

Such cross-cutting units are known from EP 0 538 513 B1. They are used in particular for edge banding machines, with the aid of which edge material in the form of a banding edge can be glued to a long side of the workpiece. After the gluing, the gluing edge has an edge protrusion that can be separated by means of the cross-cutting unit.

A saw unit with a saw blade that is usually driven by an electric motor is used for the separation. The saw unit is held at an angle to the direction of movement of the workpiece and can be moved from a position above or below half of the workpiece into a position below or above the workpiece and then moved back, an edge protrusion being cut off during the movement by means of the saw blade.

To align the saw blade at the level of the front or rear transverse side of the workpiece, the cross-cutting unit comprises a feeler element, the touch surface of which is flush with the cutting plane of the saw blade. The feeler element can be placed on the front or rear transverse side of the workpiece, so that the saw blade can be positioned at the level of the front or rear transverse side of the workpiece. This makes it possible to cut off the edge protrusion while the saw unit is moved obliquely to the direction of movement of the workpiece from a position above or below the workpiece to a position below or above the workpiece.

During the movement of the saw unit, the touch surface of the touch element slides along the transverse side of the workpiece. In many cases, a glue edge has been attached to this transverse side in a previous operation, which usually has a sensitive surface. The sliding of the sensing element can damage the surface of the gluing edge attached to the transverse side of the workpiece in the form of tactile strips that are recognizable for the user. This lowers the quality of the finished workpiece.

The object of the present invention is to develop a cross-cut unit of the type mentioned at the outset in such a way that the risk of loading Damage to the surface of the transverse side of the workpiece is avoided.

This object is achieved according to the invention in a generic cross-cutting unit in that the sensing element comprises an alignment element which can be moved together with the saw unit and a sensing element which can be moved relative to the alignment element and has a sensing surface.

The alignment element can be rigidly connected to the saw unit during the movement of the saw unit and can ensure the alignment of the saw blade with respect to the transverse side of the workpiece during the severing process. In contrast, the feeler element, which is movable with respect to the alignment element, can be fixed in place on the transverse side of the workpiece, so that a relative movement between the feeler element and the transverse side of the workpiece is eliminated. This reliably prevents damage to the cross-workpiece side when cutting off excess edges.

The feeler element is preferably held on the alignment element such that it can be displaced perpendicularly to the workpiece pass plane. For this purpose, interlocking guide means can be arranged on the feeler element and on the alignment element.

In a particularly preferred embodiment of the invention it is provided that the feeler element is held on the alignment element by means of a guide rail and a guide slide which can be moved along the guide rail. It is beneficial if the sledge and guide rail have mutually engaging sections, because this can be ensured in a structurally simple manner that the sensing element maintains its alignment relative to the workpiece, while the alignment element is moved together with the saw unit relative to the workpiece.

The guide rail is preferably held on the alignment element and the guide slide on the sensing element. It is particularly advantageous here if the sensing element can be releasably connected to the guide carriage, since the orientation of the sensing element can thereby be adjusted.

In an embodiment that can be produced at low cost, it is provided that the guide rail is connected in one piece to the alignment element.

In a particularly preferred embodiment, the feeler element is held on the alignment element by means of a linear guide, for example a dovetail guide. A linear guide - preferably a linear guideway using rotating balls - enables a practically backlash-free and low-friction relative movement between the probe and alignment element. By means of a dovetail guide, it can be prevented in a structurally simple manner that the feeler element is lifted from the alignment element during movement. The feeler element can be designed, for example, as a feeler bar, wherein an end face of the alignment element facing the workpiece can preferably be covered by means of the feeler bar.

In a particularly interference-insensitive embodiment, it is provided that the sensing element comprises at least one stop to limit the movement of the sensing element relative to the alignment element. For example, an upper and a lower stop can be provided, with the aid of which the movement of the probe element perpendicular to the plane of the workpiece passage can be limited. This prevents erroneous detachment of the sensing element from the alignment element.

It is advantageous if an elastic buffer element is assigned to the stop, so that a metallic hard impact is avoided at the end of the movement of the sensing element relative to the alignment element.

If the edge protrusion projecting beyond the rear transverse side of the workpiece is to be cut off by means of the saw unit, it is advantageous if the sensing element comprises a sensing roller that can be placed on the upper side of the workpiece and unrolled over the rear transverse side of the workpiece, the one on the rear transverse side of the workpiece The contact area of the feeler roller that can be created protrudes beyond the touch surface in the direction of movement. The feeler roller, which is preferably made of a rubber-elastic material or has a rubber-elastic covering, rolls over the rear transverse side when the sawing unit assigned to the rear transverse side of the workpiece is positioned, in order then to assume a position below the workpiece. Since the If the contact area of the sensing roller protrudes beyond the sensing surface in the direction of movement, the sensing surface assumes a position at a distance from the rear transverse side of the workpiece during the rolling movement of the sensing roller. If the feeler roller reaches the underside of the workpiece, the feeler element can be placed on the rear transverse side of the workpiece during the further movement of the assigned saw unit and remain in this relative position to the workpiece, so that damage to the rear transverse side of the workpiece occurs during the rollover movement of the feeler roller the sensing element is reliably prevented.

The following description of a preferred embodiment of the invention serves in conjunction with the drawing for a more detailed explanation. Show it:

FIG. 1: a simplified diagrammatic illustration of a cross-cutting unit for severing edge protrusions protruding beyond a front and a rear transverse side of a workpiece;

FIG. 2 shows a side view of a sensing element of the cross-cutting unit when it is applied to a front transverse side of the workpiece;

FIG. 3: a side view corresponding to FIG. 2 when the front edge overhang is cut off;

Figure 4: a side view corresponding to Figure 2 after completion

Cutting off the front edge overhang; Figure 5: a side view corresponding to Figure 2 when positioning a probe on the rear transverse side of the workpiece;

Figure 6: a side view corresponding to Figure 2 when severing the rear edge projection and

Figure 7: a side view corresponding to Figure 2 after the completion

Cut off the rear edge overhang.

FIG. 1 shows a schematic illustration of a cross-cutting unit, generally designated by reference numeral 10, for severing edge protrusions 12 or 14 from a gluing edge 16 which has been glued to a long side 18 of a workpiece 20. The cross-cutting unit 10 forms one of several stations of a machine for the processing of plate-shaped workpieces which are moved in a straight line and continuously in a workpiece pass plane. Here, the gluing edge 16 is glued to the longitudinal side 18 of the workpiece 20 in a gluing station upstream of the cross-cutting unit 10. The gluing edge 16 projects in the direction of movement 22 of the workpiece 20 to the front over the front transverse side 24 and to the rear beyond the rear transverse side 26 of the workpiece 20 and forms the edge projections 12 and 14 in these areas.

To cut off the front edge protrusion 12, the trimming unit 10 comprises a front saw unit 28, and to cut off the rear edge protrusion 14, the trimming unit 10 has a tere saw unit 30. The two saw units 28 and 30 each comprise an electric motor 32, 33 with the aid of which a front saw blade 34 or a rear saw blade 36 can be driven, in order to cut off the respective edge protrusions.

In the exemplary embodiment shown, the sawing units 28 and 30 are each held on a column guide 38 or 40 oriented obliquely to the direction of movement 22 of the workpiece 20 and can be moved between a position above the workpiece 20 and a position below the workpiece 20. Alternatively, linear guides, preferably with recirculating ball units, could also be used instead of column guides. The column guides 38 and 40 each comprise two columns 42, 44 aligned parallel to one another, obliquely to the direction of movement 22 of the workpiece 20, on which a carriage 46 is slidably held, which holds the electric motor 32 and 33 and the saw blade 34 held in a rotationally fixed manner on its drive shaft 48 or 36 wears. To drive the carriages 46, the sawing units 28 and 30 in the present exemplary embodiment each comprise a hydraulically or pneumatically actuable working cylinder 50, which cooperates with a piston rod, not shown in the drawing, which is known per se and at the free end of which one of the carriages 46 is held. By applying pressure to the working cylinders 50, the sawing units 28 and 30 can thus be moved along the column guides 38 and 40, respectively. Alternatively, the carriages 46 could also be driven by means of controlled, in particular CNC-controlled motors (linear motors). The front saw unit 28 comprises a front feeler 52, with the help of which it can be ensured that the front saw blade 34 is aligned with the front transverse side 24 of the workpiece 20 during the severing of the front edge projection 12. A rear feeler 54 is provided for the rear saw unit 30, with the help of which it can be ensured that the rear saw blade 36, when the rear edges are detached, protrudes 14 and is flush with the rear transverse side 26 of the workpiece 20.

As can be seen in particular from FIGS. 2, 3 and 4, the front feeler element 52 has a feeler element that can be placed on the front transverse side 24 in the form of a front feeler bar 56, which forms a front feeler surface 58 facing the workpiece 20 and with a front guide slide 60 is screwed. The front feeler element 52 also includes an alignment element in the form of a front bracket 62, which is connected to the electric motor 32 of the front saw unit 28 via a holder (not shown in the drawing, preferably adjustable for adjustment purposes) and on its end face 63 facing the workpiece 20 carries a guide rail 64, along which the front guide carriage 60 is slidably held. The guide carriage 60 and the guide rail 64 here form a linear guide, in the exemplary embodiment shown a dovetail guide, by means of which the front contact strip 56 and the front retaining bracket 62 are held so that they can be displaced relative to one another perpendicularly to the plane of the workpiece passage. A hook-shaped projection 66 is arranged below the guide rail 64 on the front mounting bracket 62 and carries a rubber buffer 68 on its upper side facing the guide rail 64. On the back 70 of the front key strip 56 facing away from the front key surface 58, a first stop 72, which is arranged underneath the guide carriage 60 and is connected in one piece to the key strip 56, is assigned to the rubber buffer 68. At a vertical distance from the first stop 72, the front key strip 56 carries a second stop 76 on its underside 74 facing away from the projection 66, which can be placed against the underside of the projection 66 facing away from the rubber buffer 68. The stops 72 and 76 limit the movement of the front key bar 56 relative to the front bracket 62 perpendicular to the workpiece pass plane.

The rear feeler 54 is configured essentially in accordance with the front feeler 52. As is particularly clear from FIGS. 5, 6 and 7, the rear feeler element 54 comprises a rear feeler bar 78 which, facing the rear transverse side 26 of the workpiece 20, forms a rear feeler surface 80 and is screwed to a rear guide carriage 82. The rear feeler element 54 also includes an alignment element in the form of a rear mounting bracket 84, which on its end face 85 facing the workpiece 20 carries a guide rail 86 which is integrally connected to the mounting bracket 84 and on which the rear guide carriage 82 is held so as to be displaceable perpendicularly to the workpiece passage plane, wherein the guide rail 86 and the guide carriage 82 form a linear guide, not shown in the drawing, in the form of a dovetail guide known per se. Above the guide rail 86, the rear bracket 84 carries a hook-like projection 88, on the top of which a rubber buffer 90 is arranged.

The rear key strip 78 forms on its rear side 92 facing away from the rear touch surface 80 a first stop 94 which is arranged above the rear guide carriage 82 and which can be placed on the projection 88 of the rear retaining bracket 84 from below. On its upper side 96, the rear key strip 78 carries a second stop 98, which can be placed onto the rubber buffer 90 from above. By means of the stops 94 and 98, the movement of the rear key bar 78 relative to the rear bracket 84 is limited perpendicular to the plane of the workpiece pass.

The rear mounting bracket 84 carries, below the guide rail 86, a bearing fork 100 projecting in the direction of the rear transverse side 26, on which a rubberized feeler roller 102 is freely rotatably mounted about an axis of rotation 104 oriented perpendicular to the direction of movement 22 of the workpiece 20 and perpendicular to the longitudinal direction of the guide rail 86. The feeler roller 102 is arranged in relation to the rear feeler bar 78 in such a way that its contact area 106 that can be placed on the rear transverse side 26 of the workpiece 20 projects beyond the rear feeler surface 80 in the direction of movement 22 of the workpiece 20.

The workpiece 20 is continuously moved in the direction of movement 22 during its processing. For this purpose, means of transport known per se and therefore not shown in the drawing are used for set, for example conveyor belts or conveyor chains. To cut off the front edge protrusion 12, the front saw unit 28 is moved into such a position by means of the associated working cylinder 50 that the front transverse side 24 strikes the front touch surface 58 of the front touch bar 56. The latter assumes its lowered position shown in FIG. 2, in which the first stop 72 rests on the rubber buffer 68 of the projection 66. When the front transverse side 24 strikes the front touch surface 58, the front saw blade 34 is driven by the electric motor 32 and the working cylinder 50 holds the front touch strip 56 in contact with the front transverse side 24. However, the movement of the front saw unit 28 along the column guide 38 becomes here is not hindered, so that the continuously moving workpiece 20 moves the front saw unit 28 downward from the position shown in FIG. 2 into the position shown in FIG. 3, the front edge projection 12 being cut off. During the movement of the front saw unit 28, the front holding bracket 62 connected to the electric motor 32 executes a relative movement to the workpiece 20 while the front touch bar 56 is held immovably relative to the workpiece 20, so that there is a relative movement between the front holding bar 62 and the front touch bar 56 sets. Has the front bracket 62 when moving the front saw unit 28 such a position that the projection 66 strikes the second stop 76 of the front key bar 56, the front saw unit 28 is accelerated downward by pressurizing the associated working cylinder 50 so that the front key bar 56 lifts off the front transverse side 24 and automatically moves downward along the front guide rail 64 due to gravity, until the first stop 72 hits the rubber buffer 68, as shown in FIG. 4. The front saw unit 28 now assumes a position below the workpiece 20 so that the workpiece 20 can be moved along via the front saw unit 28 during further processing.

In the course of the further movement of the workpiece 20, the rear saw unit 30 is moved into a position above the workpiece 20 by pressurizing the associated working cylinder 50 such that the feeler roller 102 comes to rest on the upper side of the workpiece 20. The rear saw unit 30 remains in this position shown in FIG. 5 until the feeler roller 102 reaches the rear transverse side 26 of the workpiece 20 and rolls down along it. Since the contact area 106 of the feeler roller 102 protrudes beyond the rear feeler surface 80 in the direction of movement 22, the rear feeler bar 78, without touching the rear transverse side 26, can be lowered together with the rear holding bracket 84 until the feeler roller 102 is under the workpiece 20 dives. The rear key strip 78 is then applied to the rear transverse side 26 by means of the working cylinder 50 and remains in this position, while the rear holding bracket 84 is moved downward along the column guide 40 with the rear saw unit 30. Thus, a relative movement occurs between the rear key strip 78 and the rear retaining bracket 84, while the rear touch surface 80 is held stationary on the rear transverse side 26 of the workpiece 20. While the rear saw unit 30 is being moved, the rear saw blade 36 is simultaneously driven by the electric motor 33, so that the rear edge projection 14 is cut off. Reaches the rear saw unit 30 such a position that the projection 88 strikes the first stop 94 of the rear button bar 78, the lowering movement of the rear saw unit 30 is braked so that the continuously moving workpiece 20 lifts off the rear button bar 78 and this automatically due to gravity moves downward along the rear guide rail 86 until the second stop 98 hits the rubber buffer 90.

After both edge protrusions 12 and 14 have been cut off, the two sawing units 28 and 30 are moved back into their starting position above the workpiece pass plane, so that a new operation can then be carried out.

Claims

1. Cross-cutting unit for machines for processing rectilinearly and continuously moving plate-shaped workpieces in a workpiece passage plane for separating overhangs of edge material that protrude beyond the front and rear transverse sides of the workpieces that are oriented essentially transversely to the direction of movement of the workpieces Is attached to the long sides of the workpieces, with at least one saw unit comprising a motor-driven saw blade, which is held so that it can be moved obliquely to the direction of movement of the workpieces between a position above the workpieces and a position below the workpieces, and with a sensing element assigned to the saw blade and having a sensing surface, wherein the touch surface is aligned with the cutting plane of the saw blade and can be placed on the front or rear transverse side of the workpieces, characterized in that the sensing element (52, 54) is a mi t of the saw unit (28, 30) movable alignment element (62, 84) and a movable relative to the alignment element (62, 84), the sensing surface (58, 80) having sensing element (56, 78).

2. cutting unit according to claim 1, characterized in that the sensing element (56, 78) is held perpendicular to the workpiece pass plane on the alignment element (62, 84).

3. Cutting unit according to claim 1 or 2, characterized in that the feeler element (56, 78) by means of a guide rail (64, 86) and a guide slide (60, 82) movable along the guide rail (64, 86) on the alignment element (62, 84) is held.

4. cutting unit according to claim 3, characterized in that the guide rail (64, 86) on the alignment element (62, 84) and the guide carriage (60, 82) on the sensing element (56, 78) is held.

5. cutting unit according to claim 4, characterized in that the sensing element (56, 78) with the guide carriage (60, 82) is releasably connectable.

6. Cutting unit according to claim 4 or 5, characterized in that the guide rail (64, 86) is integrally connected to the alignment element (62, 84).

7. cutting unit according to one of the preceding claims, characterized in that the sensing element (56, 78) is held by means of a linear guide on the alignment element (62, 84).

8. trimming unit according to one of the preceding claims, characterized in that the sensing element is designed as a touch bar (56, 78).

9. cutting unit according to one of the preceding claims, characterized in that the sensing element (52, 54) at least includes a stop (72, 76, 94, 98) to limit the movement of the feeler element (56, 78) relative to the alignment element (62, 84).

10. cutting unit according to claim 9, characterized in that at least one stop (72, 98) is assigned an elastic buffer element (68, 90).

11. Cutting unit according to one of the preceding claims, characterized in that the sensing element (52, 54) comprises a contact roller (102) which can be placed on the upper side of the workpiece (20) and can be unrolled via the rear transverse side (26) of the workpiece (20), wherein the contact area (106) of the sensing roller (102) which can be placed on the rear transverse side (26) of the workpiece (20) projects in the direction of movement (22) beyond the sensing surface (80) assigned to the rear transverse side (26).